Quick Answer
Yes, there are solar-powered pumps designed to fill and maintain water cisterns, offering a reliable and eco-friendly solution for off-grid water supply. These pumps can be connected to a PV panel or a battery bank for operation. They come in various sizes to suit different cistern capacities.
Choosing the Right Solar-Powered Pump
When selecting a solar-powered pump for your cistern, consider the total head (TH) and flow rate (Q) required to fill or maintain your cistern. The total head is the sum of the height of the cistern, piping, and fittings. For example, a cistern with a 10-foot height and 100 feet of 1-inch piping would have a total head of 110 feet. To calculate the required flow rate, consider the cistern’s capacity and refill time. A 10,000-gallon cistern, with a 1-gallon per minute (GPM) flow rate, would fill in 10 hours.
Sizing the Cistern and Pump System
A general rule of thumb for sizing a cistern is to provide at least 2-5 gallons per person per day for drinking, cooking, and hygiene. For a family of four, a 20,000-gallon cistern would be a suitable size. When selecting a solar-powered pump, ensure it can handle the total head and flow rate calculated for your system. A pump with a flow rate of 5 GPM and a TH of 150 feet would be suitable for the previously mentioned cistern and piping scenario.
Installing the Solar-Powered Pump System
When installing a solar-powered pump system, ensure the PV panel is sized correctly for the pump’s power requirement. A general rule of thumb is to size the PV panel to provide 1.5 to 2 times the pump’s power requirement. For example, a 200-watt pump would require a 300-400 watt PV panel. It’s also essential to consider the system’s voltage and current requirements to ensure compatibility with the pump and any other components.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.